Rock crusher



Dec. 29, 1936. J. RAsMussEN ROCK GRUSHER Filed Feb. 1, `1935 3Sheets-Sheet l ,1| l l l M .E lm y M M Dec. 29, 1936. J. RAsMUssl-:N y2,065,612

ROCK CRUSHER Filed Feb. l, 1935 v 3 Sheets-Sheet 2 INVENTOR. Jai/y@SWZ/6.5i#

Dec. 29, 1936. y J, RASMUSSEN 2,065,612

ROCK CRUSHER Filed Feb. l, 1935 3 Sheets-Sheet 3 3. INVENTOR.

ATTORNEY.

Patented Dec. 29, 1936 UNITED STATES lPATENT OFFICE 2 Claims.

This invention relates to a rock Crusher. The usual rock crusheroperates from a heavy pitman suspended from an eccentric drive shaftwhich requires the operating motor to constantly lift the Weight of thepitman and its associated toggle system. Also in the usual crusher, theline of force to the crushing body is below and out of alignment withthe drive shaft. This indirect application of the crushing force resultsin destructive bending stresses in the frame and operating mechanism andcauses frictional strains which result in great loss o-f power.

The principal object of the present invention is to provide a rockcrusher construction in which the line of force from the power shaft tothe point of maximum crushing will be in a straight line; in which thepower will not be required to lift akheavy pitman or toggle system; inwhich the power will be applied to the crushing jaws opposite thelocation of the largest rocks; and in which the moveable jaw will moveinwardly to crush the rock and downwardly to grind and move the rocktoward the discharge.

Another object of the invention is to provide crushing faces which willgrip smooth rocks of the niggerhead type and yet which will allow arapid discharge of the crushed material.

A further object of the invention is to so construct the crusher thatshould tramp steel or other uncrushable material accidentally enterbetween the jaws, easily replaceable bolts will be sheared withoutdamage to the crusher mechanism.

A still further object is to provide a crusher in which the variousparts will be interchangeable when worn so as to equalize the wearthereon and increase the life thereof.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy, and efciency.These will become more apparent from the following description.

In the following detailed description of the invention reference is hadto the accompanying drawings which form a part hereof. Like numeralsrefer to like parts in all views of the drawings and throughout thedescription.

In the drawings:-

Fig. 1 is a plan view of the preferred form of the improved crusher.

Fig. 2 is a longitudinal section therethrough, taken on the line 2 2,Fig. 1.

Fig. 3 is a plan View of the toggle plate.

Fig. 4 is a side view thereof.

Fig. 5 is a plan view of the eccentric member.

Fig. 6 is a side view of the eccentric member.

Fig. 7 is a side view of the crusher of Fig. 1.

Fig. 8 is an enlarged section through the thrust bearing and block.

Fig. 9 is a plan View, partially in section, of the 5 thrust block.

Fig. 10 is a detail perspective view of a shim plate employed in thecrusher.

Fig. ll is a longitudinal section through an alternate form of theinvention. 10

The invention comprises: a supporting and enyclosing frame I0 preferablyconsisting of two side plates integrally joined by a head strut II andan inclined fixed jaw support I2. The upper edge of the frame I0supports two angle bearings 15 I3 in which a power shaft I4 is carried.The shaft I4 is provided with the usual y wheels I5 and drive pulley I6and intermediate the bearings I3, with an eccentric I'I.

A jaw shaft I8 and a pitman shaft I9 also ex- 20 tend between the sideplates of the frame IIl. The extremities of the jaw shaft I8 are carriedin sliding boxes 63 which may be moved horizontally in box. framesformed on the side plates ofthe frame I0, by means of suitable setscrews 2|. The pitman shaft I9 is permanently journalled in the sideplates of the frame I 0.

'Ihe jaw shaft I8 carries a movable jaw member 22 which is fixed thereonby means of a set screw 23. A movable jaw plate 24 is clamped to 30 theforward face of the jaw member 22 b-y means of suitable clamp bolts 25.The upper and lower edges of the jaw plate 24 are bevelled and the loweredge rests on a similarly bevelled shoulder 26. The clamp bolts 25 havebevelled gibs 61 35 under their heads for clamping the upper edge. Thisconstruction allows the jaw plate 24 to be removed and inverted when itbecomes worn along its lower face.

A removable stationary jaw plate 2l is carried .-40 on the inner face ofthe frame jaw support I2. On the back of the plate 21 is a laterallyextending rib 28 which fits into a laterally extending groove in the jawmember I2 to prevent the plate from shifting thereon. '45

The crushing space between the plates 24 and 2l is closed at the sidesby means of removable cheek plates 29 which are similar to each otherand reversible as to position. Each plate carries 50 a V-shaped clampingflange 30 providedwith a slotted opening 3| through which a clamp screw32 passes to hold the check plate down in place.

' When the plates are reversed as tol position, the ,bolt 32 will occupythe other extremity of the 55 iit f'bousn.

slotted opening 3I and the other leg of the V shaped flange 30.

The motion of the eccentric I1 is transmitted to the movable jaw member22 by means of three members: an eccentric member 33, a pitman 35, and atoggle plate 31. The eccentric member 33 surrounds the eccentric I1 andextends forwardly therefrom, terminating in a removable thrust plate 34.The thrust plate contacts the upper extremity of the pitman 35- whichextends upwardly from the pitman shaft I9, upon which it is secured bymeans of a suitable set screw 36.

The motion of the pitman 35 is transmitted to.

the mOVable jaw member 22 by means of the toggle plate 31. Y

It can be readily seen that the above'construction transmits theeccentric motion of the eccentric l1 to the pitman 35 so'as to impart arocking motion to the latter. This motion is then. transmitted to themovable jaw member 22 to cause ,itsv crushing plate2lI` to approach andwithdraw from the plate 21.

It is desired to call attention to the fact that the forward face of thejaw member 22 is offset In front of the axis of the shaft I8. Owing tothe forward position of the plate 24 with reference to the shaft I8,this .plate will swing both inwardly and Ydownwardly as indicated by thearrows in Fig. -2. The forward face of the plate 24 is groovedlaterally, as indicated by the corrugations38. The forward face of theplate 21V is grooved vertically, asl indicated bythe corrugationsY 39.The lateral corrugations allow the movable plate to grip smooth rocksurfaces so as to hold the latter between the jaws. The verticalcorrugations allow the crushed rock to readily flow downwardly.V It ispreferred to terminate the corrugations above the discharge spacebetween the bottoms of the jaws so as to prevent passage of oversizematerial.

Ther entire toggle system'is held Ytogether by means of a compressionspring 40 acting under an adjusting nut 4I on va.v `spring vrod42. Theforward extremity of the spring rod engages an ear 43 on the movable jawmember 22 and extends through an ear 44 on the eccentric member 33. Nopower is absorbedy in compressing the spring 40 since it moves with themovement of the jaws.

The toggle plate 31 and the thrust plate 34 are formed at their pressurepoints with rounded cylindrical bearing edges, as indicated at 45, Fig.8.v To receive the thrust of these heads and to provide a renewablewearing surface therefor, a thrust block 46, as shown in Fig. 9, isinserted in both faces of the pitman 35 and the rear face of the movablejaw member 22. The thrust blocks 46 are dovetailed in shape and slideinto place in horizontal dove-tailed grooves ln'their respectivemembers. The block 46 in the movable jaw member 22 is provided with acentral lug 41 which engages a recess 48 in the toggle plate to preventVside movement of the latter. The thrust plate 34 is attached to theeccentric member 33 by means of suitable attachment bolts 49 rso thatthe contacting edge can be replaced with- Voutrequiring replacement of.the entiregeccentric` member 33. j

Itis desired to call attention to the fact that Vthe thrust plate 34rests against the shoulder'50 on the eccentric member 33 so as totransmit its push in a straightline to the axis ofthe eccentric I1without exerting al shearing action on` the End plates and jaw platesCrushers are often :ing portions Vof the machine.

illustrated, particularly designed Should incompressible material enterbetween the jaws, the two parts of the toggle member will slide uponeach other so as to shear the bolts 53 and completely relieve the strainon the remain- In crushing easily crushed materiaLonly a few of thebolts 53 need be inserted so that Vthey will easily shear, should moredifcultly crushable material enter between the jaws.

The pressure zones of the bearing edges 45 are lubricated fromlubrication grooves 54 formed along the top of each thrust block. Oilholes lead from the grooves 54 to the upper sides of the bearing edges.The lubrication then works downwardly to the friction zones. Oil orgrease is fed to the grooves 54 from suitable lubricators 55.

The neness of the crushing is of course determined by the space betweenthe bottom edges of the two plates 24 and 21. This space can` beregulated'by means of the set screws 2|. It has been found,however,'that in actual use., the vlbration and pressure upon these setscrews is sufficient Ato upset and distort them. This upsetting actionmay be relieved by means of shim plates 56 Vas shown in Fig. 11. Theseplates are furnished in various'thicknesses and, after the set screwshave been adjusted may be inserted in the box frames 20 toreceive thepressure of the sliding boxes 63. provided with a notch 64 for allowingit to pass the set screw 2 I.

In Fig. 9, an alternate form of the invention is for small laboratorymachines and the like. In this form the invention is similar to thepreceding form with the exception of two features. In this form,

vthe. pitman 35 and the toggle plate 31 have been eliminated, and asingle eccentric member 58 has been used in their placev which carriesformed thereon a 'relatively long thrustarm 59 Ywhich pushes directlyagainst the rear of a. movable On this 'form 'it is necessary for thepower to 1 compress the spring 68 during' thecrushing operation, butowing to the fact'that this'construction is employed only on the verysmall machine Yonly a light spring is necessary.

Each of the platesV 56 is While afspecic form of the improvement has`IRS Lbeen described andillustrated herein, it is desired to beunderstoodthat the same may be varied,

ywithin thescope of the appended claims, without 'departing from the'spirit ofthe invention.

Having thus described the invention, what is "claimed and desiredsecured by Letters Patent l. A rockcrusherf comprising a' frame, a.fixed jaw support carried by said frame, a drive shaft supportedbyl's'aidframe; V'am'o'vable jaw member l'IIS supported by said frame incoacting relation to said fixed jaw support, an eccentric on said driveshaft, an eccentric member riding on said eccentric, a pitman hinged atits lower extremity in and to said frame below said eccentric and eX-tending upwardly for receiving the thrust from the eccentric member, atoggle. plate extending from the upper extremity of said pitman to saidmovable jaw member, said pitman having a portion engaged between saideccentric member and said toggle plate, and spring controlled meanscarried by the movable jaw member and the eccentric member for holdingabutting portions of the movable jaw member, toggle member, pitman, andeccentric member in contact with each other.

2. A rock crusher comprising a frame, a fixed jaw support carried bysaid frame, a drive shaft supported by said frame, a movable jaw membersupported by said frame in coacting relation to the xed jaw support, aneccentric on said drive shaft, an eccentric member riding on saideccentric, a pitman hinged at its lower end in and to said frame belowsaid eccentric and extending upwardly for receiving the thrust from theeccentric member, a toggle member extending between the upper endportion of said pitman and a confronting upper portion of said movablejaw member, ears extending upwardly from the eccentric member and themovable jaw member, a rod extending between the eccentric member and themovable jaw member over said pitman and loosely engaged through saidears, said rod having a head atone end engaging the ear of the movablejaw member and its other end portion projecting from the ear of theeccentric member, a spring about the projecting end portion of said rodhaving one end bearing against the ear o-f the eccentric member, and anabutment for the other end of the spring adjustably carried by said rod,said rod and spring constituting spring controlled means for holdingabutting portions of the movable jaw member, toggle member, pitman andeccentric member in contact with each other.

JOHN RASMUSSEN.

